On the covered LG refrigerator, tt means a water tank fault — LG's own wording: the water tank is missing or not inserted correctly, or the detection sensor is malfunctioning. First, check the water tank is present and fully seated.
Differential
Likely causes of “LG refrigerator code tt”, and how to tell them apart
- 1
A water tank missing or not seated
What separates it tt shows and the water tank is out of position
How to confirm LG says the water tank is missing or not inserted correctly
- 2
A failed detection sensor
What separates it The tank is seated and tt stays, which points to a failed detection sensor
How to confirm LG says the detection sensor may be malfunctioning
- 3
Water or debris where the tank seats
What separates it The tank is in but the seat or connector is wet or dirty
How to confirm Remove the tank, wipe the seat dry and push it back until it clicks
Before you touch a setting
Record this first — changing settings destroys the evidence
- The exact characters shown on the display: tt
- Whether the tank is fully inserted
- Note whether the dispenser works before you start troubleshooting
Try in this order
0 of 4 completedWhat to do first
ReversibleCheck the water tank is present and fully seated.
Correct only the documented fault domain
ReversibleReseat the tank; if the code stays with the tank correctly fitted, the detection sensor is the remaining cause.
Reseat the tank
ReversibleRemove the water tank and insert it fully until it seats.
Request service
ReversibleIf tt stays with the tank seated, request service.
Model-specific
What is true of this model and not of its siblings
- Displayed as
- tt.
- Parts named
- Water tank; detection sensor.
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. The tank reseat is LG's own.
Exact questions
Common questions
What does tt mean on a LG refrigerator?+
a water tank fault — LG's own wording: the water tank is missing or not inserted correctly, or the detection sensor is malfunctioning.
Can a wet connector cause tt?+
Moisture or debris where the tank seats can interfere with the detection sensor, so dry the seat before you assume the sensor has failed.